July 1 (Reuters) - Ukraine has struck a Russian oil refinery in the city of Ufa, more than 1,300 km (800 miles) from the frontline for the second time, President Volodymyr Zelenskiy said on Wednesday, as Kyiv steps up its strikes deep in Russia. "Every day, our plan for imposing Ukrainian long-range sanctions is being implemented," Zelenskiy said on X, referring to Ukrainian attacks deep inside Russian territory. "This is an entirely just response to everything Russia is doing against us." Zelenskiy also reported a strike on what he said was a "strategic" Russian military-industrial facility in the Penza region,...